# US 12,190,805 B2 · Display panel, method for driving display panel, driving circuit and display device

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- Number: US 12,190,805 B2
- Document ID: US12190805B2
- Status: Granted
- Kind: B2
- Application number: 17/983,416
- Filed: 2022-11-09
- Published: 2024-03-07
- Granted: 2025-01-07
- Earliest claimed: 2022-11-09
- Assignees: Xiamen Tianma Display Technology Co., Ltd.
- Applicants: Xiamen Tianma Display Technology Co., Ltd.
- Inventors: Yuheng Zhang; Xiaoting Xing; Xueqi Sun
- Web page: https://patentgrep.com/patent/US12190805B2

## CPC

- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- G09G 2300/0814: used for selection purposes, e.g. logical AND for partial update
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
- G09G 2300/0866: by means of changes in the pixel supply voltage
- G09G 2310/061: for resetting or blanking
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements
- G09G 2330/021: Power management, e.g. power saving
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

The present application discloses a display panel and its driving method, driving circuit and display device. The display panel includes a pixel circuit and a light-emitting element; the pixel circuit includes a first reset module configured to provide a reset signal for the light-emitting element under control of a first control signal; operation modes of the display panel includes a first mode and a second mode, a brightness of the display panel is L1 under the first mode, the brightness of the display panel is L2 under the second mode, and L1<L2; a refresh frequency of the first control signal is F1 under the first mode, the refresh frequency of the first control signal is F2 under the second mode, and F1<F2.

## Claims

### Claim 1

A display panel comprising a pixel circuit and a light-emitting element, wherein
the pixel circuit comprises a first reset module configured to provide a reset signal for the light-emitting element under control of a first control signal;
operation modes of the display panel comprise a first mode and a second mode, a brightness of the display panel is L1 under the first mode, the brightness of the display panel is L2 under the second mode, and L1<L2;
a refresh frequency of the first control signal is F1 under the first mode, the refresh frequency of the first control signal is F2 under the second mode, and F1<F2.

### Claim 2 (depends on 1)

The display panel according to claim 1, wherein the pixel circuit further comprises a driving module and a bias adjustment module;
the driving module is configured to provide a drive current for the light-emitting element, and the driving module comprises a driving transistor;
the bias adjustment module is configured to provide a bias adjustment signal to a first terminal or a second terminal of the driving transistor under control of the first control signal.

### Claim 3 (depends on 2)

The display panel according to claim 2, wherein
in a duration of an image frame of the display panel, an operation process of the pixel circuit comprises a pre-light emission stage and a light emission stage;
wherein the pre-light emission stage of the pixel circuit comprises a reset stage in a duration of at least one image frame, and the first reset module is configured to provide the reset signal for the light-emitting element in the reset stage.

### Claim 4 (depends on 3)

The display panel according to claim 3, wherein
the pixel circuit further comprises a data writing module configured to selectively provide a data signal for the driving module;
one data writing cycle of the display panel comprises in total S frames of refreshed images comprising a data writing frame and a holding frame, and S>0;
the data writing frame comprises a data writing stage, and the data writing module is configured to write a data signal into a gate of the driving transistor in the data writing stage;
the holding frame does not comprise the data writing stage;
wherein at least the data writing frame comprises the reset stage.

### Claim 5 (depends on 4)

The display panel according to claim 4, wherein
at least the data writing frame further comprises an initialization stage, and the gate of the driving transistor is configured to receive an initialization signal for initialization in the initialization stage;
a duration of the reset stage is t1, and a duration of the initialization stage is t2;
wherein t1<t2.

### Claim 6 (depends on 4)

The display panel according to claim 4, wherein
at least one data writing frame further comprises M initialization stages, and the gate of the driving transistor is configured to receive an initialization signal for initialization in the initialization stage;
at least one data writing frame comprises N reset stages;
wherein N>M≥1, and N and M are integers.

### Claim 7 (depends on 4)

The display panel according to claim 4, wherein
at least one holding frame comprises the reset stage, and
a duration of the reset stage in at least one holding frame is greater than a duration of the reset stage in the data writing frame.

### Claim 8 (depends on 2)

The display panel according to claim 2, wherein the pixel circuit further comprises a data writing module and a threshold compensating module, the data writing module is configured to transmit a data signal, and the threshold compensating module is configured to write the data signal into the driving module and compensate a threshold voltage of the driving module under control of a second control signal;
a refresh frequency of the second control signal is less than or equal to a refresh frequency of the first control signal.

### Claim 9 (depends on 8)

The display panel according to claim 8, wherein the refresh frequency of the second control signal is F3 under the first mode, F3=F1/n1, and n1 is a natural number greater than or equal to F1/f;
the refresh frequency of the second control signal is F4 under the second mode, F4=F2/n2, and n2 is a natural number greater than or equal to F2/f;
wherein f is a maximum refresh frequency of the second control signal.

### Claim 10 (depends on 1)

The display panel according to claim 1, wherein the pixel circuit further comprises a driving module and a bias adjustment module;
the driving module is configured to provide a drive current for the light-emitting element, and the driving module comprises a driving transistor;
the bias adjustment module is configured to provide a bias adjustment signal for a first terminal or a second terminal of the driving transistor under control of a third control signal;
the third control signal and the first control signal are different control signals.

### Claim 11 (depends on 10)

The display panel according to claim 10, wherein
under the first mode or the second mode, the refresh frequency of the first control signal is greater than or equal to a refresh frequency of the third control signal.

### Claim 12 (depends on 10)

The display panel according to claim 10, wherein
under the first mode, the refresh frequency of the first control signal is less than a refresh frequency of the third control signal;
under the second mode, the refresh frequency of the first control signal is equal to the refresh frequency of the third control signal.

### Claim 13 (depends on 1)

The display panel according to claim 1, wherein the operation modes of the display panel further comprise a third mode, the brightness of the display panel is L3 under the third mode, and L2<L3;
the refresh frequency of the first control signal is F5 under the third mode, and F2<F5;
L3−L2>L2−L1.

### Claim 14 (depends on 1)

The display panel according to claim 1, wherein the brightness of the display panel comprises a first brightness range and a second brightness range, and a brightness value in the first brightness range is less than a brightness value in the second brightness range;
the refresh frequency of the first control signal is of a same value in the first brightness range, the refresh frequency of the first control signal is of a same value in the second brightness range, and the refresh frequency of the first control signal in the first brightness range is not equal to the refresh frequency of the first control signal in the second brightness range.

### Claim 15 (depends on 1)

The display panel according to claim 1, wherein a display area of the display panel comprises a first sub-display region and a second sub-display region;
under the first mode or the second mode, the refresh frequency of the first control signal is of a same value at the first sub-display region, the refresh frequency of the first control signal is of a same value at the second sub-display region, and the refresh frequency of the first control signal at the first sub-display region is not equal to the refresh frequency of the first control signal at the second sub-display region.

### Claim 16 (depends on 15)

The display panel according to claim 15, wherein the display area of the display panel comprises a first edge and a second edge opposite to each other along a first direction, a non-display area of the display panel comprises a bonding area, and the second edge is positioned on a side of the first edge away from the bonding area;
along the first direction, the first sub-display region is positioned on a side of the second sub-display region away from the first edge;
the refresh frequency of the first control signal is F6 at the first sub-display region, the refresh frequency of the first control signal is F7 at the second sub-display region, and F6<F7.

### Claim 17 (depends on 1)

The display panel according to claim 1, wherein under the first mode, a refresh cycle of the first control signal is a first refresh cycle, and in the first refresh cycle, a duration for which the first control signal is at an ON-level is t4;
under the second mode, the refresh cycle of the first control signal is a second refresh cycle, in the second refresh cycle, the duration for which the first control signal is at an ON-level is t5, and t4=t5.

### Claim 18 (depends on 1)

The display panel according to claim 1, wherein the pixel circuit further comprises a light emission controlling module configured to cause the light-emitting element to enter a light emission stage under control of a fifth control signal, and the refresh frequency of the first control signal is less than or equal to a refresh frequency of the fifth control signal.

### Claim 19 (depends on 1)

The display panel according to claim 1, wherein
one data writing cycle of the display panel comprises in total S frames of refreshed images comprising a data writing frame and a holding frame, and S>0;
a duration of at least one holding frame is equal to an inverse of the refresh frequency of the first control signal.

### Claim 20

A display device, comprising a display panel comprising a pixel circuit and a light-emitting element, wherein
the pixel circuit comprises a first reset module configured to provide a reset signal for the light-emitting element under control of a first control signal;
operation modes of the display panel comprise a first mode and a second mode, a brightness of the display panel is L1 under the first mode, the brightness of the display panel is L2 under the second mode, and L1<L2;
a refresh frequency of the first control signal is F1 under the first mode, the refresh frequency of the first control signal is F2 under the second mode, and F1<F2.